fbi officials have told us that their investigation into this whole scandal which brought down david petraeus so far has not turned up any threat or damage to national security. since the affair with paula broadwell occurred while petraeus was the director of the central intelligence agency, the cia's inspector general has begun his own investigation. sources say the cia is looking into the general conduct of petraeus over the 4 months he headed the agency. officials say the probe is exploratory and doesn't presuppose any particular outcome. but the attorney general wants to make sure he didn't misuse any agency assets in his affair with broadwell. for the first time thursday attorney general eric holder defended the justice department's handling of the fbi summer long investigation of the broadwell/petraeus matter. holder was asked specifically about the fbi's decision to delay notifying the white house until after the election. >> we felt secure in the knowledge that a national security threat did not exist that warranted the sharing of that information with the white house or with